You Don't Practice Portion Control

Don't count a single indulgence as an excuse to throw all caution to the wind. Either order a limited amount of food, be mindful about how you're feeling as you eat, or take Jillian Michaels's extreme tip and throw away leftovers. Hopefully you have enough self-control to take a step back and say no to that second enormous slice of pizza, but do whatever works for your needs.